basic macroeconomic relationships chapter 27 mcgraw-hill/irwin copyright © 2009 by the mcgraw-hill...
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BasicMacroeconomicRelationships
Chapter 27
McGraw-Hill/Irwin Copyright © 2009 by The McGraw-Hill Companies, Inc. All rights reserved.
27-2
Chapter Objectives
• Effect of changes in income on consumption (and saving)
• Other factors that affect consumption• Effect of changes in real interest rates
on investment• Other factors that affect investment• Changes in investment have a
multiplier effect on real GDP
27-3
Basic Relationships
• What are the two things we can do with our income?–Consume (spend) or Save
• Disposable income (DI)–After taxes
• 45°line for reference–C = DI on the Line–*****turn to pg. 542
• S = DI - C
27-4
Income and Consumption
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
0 2000 4000 6000 8000 10000
Co
nsu
mp
tio
n (
bil
lio
ns
of
do
llar
s)
Disposable Income (billions of dollars)
45° Reference LineC=DI
83
8685
84
8889
9190
87
9293
9495
01
9796
9998
00
02
05
03
04
ConsumptionIn 1992
SavingIn 1992
45°
C
Source: Bureau of Economic Analysis
27-5
Consumption and Saving
• The consumption schedule• The saving schedule• Break-even income• Average propensity to consume
(APC)• Average propensity to save (APS)
APS =SavingIncome
APC =Consumption
Income
Fallacy of Composition
• The false assumption that what is true for a part will also be true for the whole.– Your experience is YOUR experience…
– …Here, we are measuring the aggregate.
• BE CAREFUL NOT TO GENERALIZE BASED ON YOUR OWN EXPERIENCE!!
27-6
27-7
Consumption and Saving
• Marginal propensity to consume (MPC)
• Marginal propensity to save (MPS)
MPC =Change in Consumption
Change in Income
MPS =Change in SavingChange in Income
27-8
Consumption and Saving(1)
Level ofOutput
AndIncome
(GDP=DI)
(2)Consump-
tion(C)
(3)Saving (S)
(1) – (2)
(4)Average
Propensityto Consume
(APC)(2)/(1)
(5)Average
Propensityto Save(APS)(3)/(1)
(6)Marginal
Propensityto Consume
(MPC)Δ(2)/Δ(1)
(7)Marginal
Propensityto Save(MPS)
Δ(3)/Δ(1)
(1) $370
(2) 390
(3) 410
(4) 430
(5) 450
(6) 470
(7) 490
(8) 510
(9) 530
(10) 550
$375
390
405
420
435
450
465
480
495
510
$-5
0
5
10
15
20
25
30
35
40
1.01
1.00
.99
.98
.97
.96
.95
.94
.93
.93
-.01
.00
.01
.02
.03
.04
.05
.06
.07
.07
.75
.75
.75
.75
.75
.75
.75
.75
.75
.25
.25
.25
.25
.25
.25
.25
.25
.25
MPC + MPS = 1 MPC and MPS measure slopes
27-9
500
475
450
425
400
375
45°
Consumption and Saving
50
25
0
370 390 410 430 450 470 490 510 530 550
370 390 410 430 450 470 490 510 530 550
C
S
ConsumptionSchedule
Saving Schedule
Saving $5 Billion
Dissaving $5 Billion
Dissaving$5 Billion
Saving $5 Billion
Disposable Income (billions of dollars)
Co
nsu
mp
tio
n (
bil
lio
ns
of
do
llar
s)S
avin
g(b
illi
on
s o
f d
oll
ars
)
27-10
Average Propensity to Consume
Source: Statistical Abstract of the United States, 2006
Selected Nations, with respect to GDP, 2006
United States
Canada
United Kingdom
Japan
Germany
Netherlands
Italy
France
.80 .85 .90 .95 1.00
27-11
What do you notice about the early 2000’s?
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
0 2000 4000 6000 8000 10000
Co
nsu
mp
tio
n (
bil
lio
ns
of
do
llar
s)
Disposable Income (billions of dollars)
45° Reference LineC=DI
83
8685
84
8889
9190
87
9293
9495
01
9796
9998
00
02
05
03
04
ConsumptionIn 1992
SavingIn 1992
45°
C
Source: Bureau of Economic Analysis
27-12
Non-income determinants of consumption and saving
• Wealth – When wealth suddenly increases, people consume
more
• Borrowing– Easy credit increases consumption, sometimes
above disposable income…but debt needs repaid in the future
• Expectations• Real interest rates
27-13
Consumption and Saving
• Other important considerations
–Switch to real GDP
–Changes along schedules
–Schedule shifts
–Stability
–Taxation
27-14
45°
Consumption and Saving
C0
S0
Disposable Income (billions of dollars)
Co
nsu
mp
tio
n (
bil
lio
ns
of
do
llar
s)S
avin
g(b
illi
on
s o
f d
oll
ars
)
C2
C1
S1
S2
27-15
Interest Rate and Investment
• Expected rate of return (r)
• The real interest rate (i) –Nominal rate less rate of inflation
• Meaning of r = i–Firms will invest as long as r ≥ i
• Investment demand curve
27-16
Investment Demand Curve
ExpectedRate of
Return (r)
CumulativeAmount ofInvestmentHaving This
Rate ofReturn or Higher
(I)
16%14%12%10%
8%6%4%2%0%
$ 05
10152025303540
r a
nd
i (
pe
rce
nt)
16
14
12
10
8
6
4
2
05 10 15 20 25 30 35 40
Investment (billions of dollars)
ID
27-17
Investment Demand Curve
• Shifts of the curve–Acquisition, maintenance, and
operating costs
–Business taxes
–Technological change
–Stock of capital goods on hand
–Planned inventory changes
–Expectations
27-18
r a
nd
i (
per
cen
t)
0
Investment (billions of dollars)
ID0ID1ID2
Increase in Investment Demand
Decrease in Investment Demand
Investment Demand Curve
27-19
Investment Demand
• Instability of investment–Durability
–Irregularity of innovation
–Variability of profits
–Variability of expectations
27-20
Gross Investment Expenditure
Source: International Monetary Fund
Percent of GDP, Selected Nations, 2006
South Korea
Japan
Canada
Mexico
France
United States
Sweden
Germany
United Kingdom
0 10 20 30
Volatility of Investment
Source: Bureau of Economic Analysis
27-21
27-22
The Multiplier Effect
Multiplier =Change in Real GDP
Initial Change in Spending
• More spending results in higher GDP
• Initial change in spending changes GDP by a multiple amount
Change in GDP = Multiplier x Initial Change in Spending
27-23
The Multiplier Effect• Causes of the initial change in spending
–Most prevalent - Changes in investment• Become increases in wage, rent, interest, profit
–Other changes – C, G, X• Rationale
–Dollars spent are received as income– Income received is spent (MPC)– Initial changes in spending cause a
spending chain
27-24
(1)Change in
Income
(2)Change in
Consumption(MPC = .75)
(3)Change in
Saving(MPS = .25)
Increase in Investment of $5Second RoundThird RoundFourth RoundFifth RoundAll other rounds Total
$ 5.003.752.812.111.584.75
$ 20.00
$ 3.752.812.111.581.193.56
$ 15.00
$ 1.25.94.70.53.39
1.19$ 5.00
Rounds of Spending1 2 3 4 5 All
$20.00
15.2513.67
11.56
8.75
5.00$5.00
$3.75
$2.81
$2.11$1.58
$4.75
ΔI=$5 billion
The Multiplier Effect
27-25
The Multiplier Effect
Multiplier =1
1 - MPC
Multiplier =1
MPS
-or-
27-26
The Multiplier and the MPC
10
5
4
3
2.5
.67
.75
.8
.9
MPC Multiplier
27-27
Squaring the Economic Circle
• Humorist Art Buchwald and the multiplier
• Suppose one person can’t buy a product
• Others subsequently impacted and cannot buy other items
• Multiple effects impact psyche• Ultimately causes multiple step impact
upon the economy as a whole
27-28
Key Terms
• 45°(degree) line• consumption
schedule• saving schedule• break-even income• average propensity
to consume (APC)• average propensity
to save (APS)
• marginal propensity to consume (MPC)
• marginal propensity to save (MPS)
• wealth effect• expected rate of
return• investment demand
curve• multiplier
27-29
Next Chapter Preview…
The AggregateExpenditures Model
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